Re: [PATCH v2 3/4] ARM: nommu: display vectors base

From	Russell King - ARM Linux <linux@armlinux.org.uk>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 3/4] ARM: nommu: display vectors base
Date	2017-01-30 15:20 +0100
Message-ID	<t5kYi-4Zy-15@gated-at.bofh.it> (permalink)
References	<t2gRc-3Mg-3@gated-at.bofh.it> <t2h0R-3PH-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Sun, Jan 22, 2017 at 08:52:12AM +0530, afzal mohammed wrote:
> The exception base address is now dynamically estimated for no-MMU,
> display it. As it is the case, now limit VECTORS_BASE usage to MMU
> scenario.
> 
> Signed-off-by: afzal mohammed <afzal.mohd.ma@gmail.com>

As I wrote elsewhere...

> diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
> index 0b5416fe7709..9ae474bf84fc 100644
> --- a/arch/arm/include/asm/memory.h
> +++ b/arch/arm/include/asm/memory.h
> @@ -83,6 +83,8 @@
>  #define IOREMAP_MAX_ORDER	24
>  #endif
>  
> +#define VECTORS_BASE		UL(0xffff0000)
> +
>  #else /* CONFIG_MMU */
>  
>  /*
> @@ -111,8 +113,6 @@
>  
>  #endif /* !CONFIG_MMU */
>  
> -#define VECTORS_BASE		UL(0xffff0000)

I think adding a definition for VECTORS_BASE in asm/memory.h for nommu:

extern unsigned long vectors_base;
#define VECTORS_BASE	vectors_base

> diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
> index 823e119a5daa..9c68e3aba87c 100644
> --- a/arch/arm/mm/init.c
> +++ b/arch/arm/mm/init.c
> @@ -522,7 +522,12 @@ void __init mem_init(void)
>  			"      .data : 0x%p" " - 0x%p" "   (%4td kB)\n"
>  			"       .bss : 0x%p" " - 0x%p" "   (%4td kB)\n",
>  
> +#ifdef CONFIG_MMU
>  			MLK(VECTORS_BASE, VECTORS_BASE + PAGE_SIZE),
> +#else
> +			MLK(vectors_base, vectors_base + PAGE_SIZE),
> +#endif

will mean that this conditional becomes unnecessary.

> diff --git a/arch/arm/mm/mm.h b/arch/arm/mm/mm.h
> index ce727d47275c..546f09437fca 100644
> --- a/arch/arm/mm/mm.h
> +++ b/arch/arm/mm/mm.h
> @@ -79,8 +79,9 @@ struct static_vm {
>  extern struct list_head static_vmlist;
>  extern struct static_vm *find_static_vm_vaddr(void *vaddr);
>  extern __init void add_static_vm_early(struct static_vm *svm);
> -
> -#endif
> +#else /* CONFIG_MMU */
> +extern unsigned long vectors_base;
> +#endif /* CONFIG_MMU */

and you don't need this here either.

Thanks.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
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Thread

[PATCH v2 0/4] ARM: v7-A !MMU support, prepare CONFIG_VECTORS_BASE removal afzal mohammed <afzal.mohd.ma@gmail.com> - 2017-01-22 04:20 +0100
  [PATCH v2 3/4] ARM: nommu: display vectors base afzal mohammed <afzal.mohd.ma@gmail.com> - 2017-01-22 04:30 +0100
    Re: [PATCH v2 3/4] ARM: nommu: display vectors base Russell King - ARM Linux <linux@armlinux.org.uk> - 2017-01-30 15:20 +0100
      Re: [PATCH v2 3/4] ARM: nommu: display vectors base Afzal Mohammed <afzal.mohd.ma@gmail.com> - 2017-01-30 22:50 +0100
  [PATCH v2 2/4] ARM: nommu: dynamic exception base address setting afzal mohammed <afzal.mohd.ma@gmail.com> - 2017-01-22 04:30 +0100
  [PATCH v2 4/4] ARM: nommu: remove Hivecs configuration is asm afzal mohammed <afzal.mohd.ma@gmail.com> - 2017-01-22 04:30 +0100
  [PATCH v2 1/4] ARM: mmu: decouple VECTORS_BASE from Kconfig afzal mohammed <afzal.mohd.ma@gmail.com> - 2017-01-22 04:30 +0100
  Re: [PATCH v2 0/4] ARM: v7-A !MMU support, prepare  CONFIG_VECTORS_BASE removal Vladimir Murzin <vladimir.murzin@arm.com> - 2017-01-25 12:30 +0100

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